Clonal relationships among naturally occurring nicotinamide-requiringSalmonella typhimurium
- 1 December 1985
- journal article
- research article
- Published by Hindawi Limited in Genetics Research
- Vol. 46 (3) , 241-250
- https://doi.org/10.1017/s0016672300022746
Abstract
SUMMARY: Salmonella typhimuriumstrains of biotype 25x have been shown in transductional cross experiments to be clonal in the Nad character. The ancestral bacterium, probably of biotype 25a, mutated to a requirement for nicotinamide and subsequently diversified in phage type and secondary biotype characters. Such a sequence of events indicates interconversion among phage types 6, 16, 46, 49, 73, 76 and 135. Strains in biotypes 1x, 9ix, 17x, 17dx, 19dx and 25hix yielded Nad+recombinants in interbiotype crosses, suggesting that each originated as an independent mutant line.This publication has 21 references indexed in Scilit:
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